What is the main purpose of th
What is the main purpose of the passage
A．To outline contrasting types of economic system.
B．To explain the science of economics.
C．To argue for the superiority of one economic system.
D．To compare barter and money-exchange markets.
A．To outline contrasting types of economic system.
B．To explain the science of economics.
C．To argue for the superiority of one economic system.
D．To compare barter and money-exchange markets.
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